Opinion arrived at in the end (10)
I believe the answer is:
conclusion
'opinion' is the definition.
(I know that conclusion is a type of opinion)
'arrived at in the end' is the wordplay.
I cannot really see how this works, but
'at' could be 'on' (location) and 'on' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for conclusion that I've seen before include "Ending" , "End; decision" .)